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The IR and NMR data were identical to those reported
The X-ray crystallographic analysis confirmed the structure
7738(14) Å , b ¼ 11.5661(13) Å , c ¼ 15.559(2) Å , a ¼ b ¼ g ¼ 908
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Two new diterpenes and ent-15α-hydroxykaur-16-en-19-oic acid 11,12-acetonide (3), together with 23 known compounds were isolated from the dried aerial parts of Nouelia insignis Franch. The structures of new compounds were determined to be ent-14β,15α-dihydroxykaur-16-en-19-oic acid (1), ent-14β-hydroxy-15-oxokaur-16-en-19-oic acid (2) on the basis of spectral and chemical evidence. The structure of ent-11α,16α-epoxy-15α-hydroxy-16S-kaur-19-oic acid (4) was confirmed by X-ray crystallographic analysis.
Journal of Asian Natural Products Research – Taylor & Francis
Published: Feb 1, 2008
Keywords: Nouelia insignis; Ent -kaurene; Diterpenic acid; Sesquiterpene lactone; Steroid
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